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In a service contract, there is the probability that the service provider will only provide the basic service mentioned in the contract and will ignore other relevant tasks associated with the work.
Because of the variable and unexpected fluctuations including but not limited to currency,additional charges,variable costs...etc.
If you dont know what exactly you wants how you can negotiate and come to actual price? we have to be very clear in our mind and should communicate it in very clearly before asking quote..
Fixed price contracts place risk on the seller, one of the project's stakeholders . If there is any type of price increase, seller would be responsible for the increased costs and cannot pass them on to the buyer.